touch db.json to combat travis not building with hexo-include-markdown

https://travis-ci.org/transloadit/uppy/builds/509314852#L3345
https://github.com/tea3/hexo-include-markdown/issues/2

package.json

@@ -116,7 +116,7 @@
     "dev:js": "cd examples/dev && npm run watch",
     "dev": "npm-run-all --parallel start:companion dev:js watch:css watch:js:lib dev:browsersync",
     "dev:no-companion": "npm-run-all --parallel dev:js watch:css watch:js:lib dev:browsersync",
-    "web:build": "cd website && node update.js && ./node_modules/.bin/hexo generate && node build-examples.js",
+    "web:build": "cd website && node update.js && touch db.json && ./node_modules/.bin/hexo generate && node build-examples.js",
     "web:clean": "cd website && ./node_modules/.bin/hexo clean",
     "web:deploy": "npm-run-all web:install web:disc web:build && ./bin/web-deploy",
     "web:disc": "node ./bin/disc.js",